IBSYS is a discontinued tape based operating system that IBM supplied with its IBM 709, IBM 7090 and IBM 7094 computers, alongside a significantly different though similar system for the IBM 7040 and IBM 7044. It was based on the FORTRAN Monitor System and Bell Labs' BESYS rather than the SHARE Operating System, and it directly supported several older language compilers and assemblers through its EXECUTE card, while newer language processors ran under IBJOB. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Classification
LicenseProprietary (Closed Source) 1 FAQs
Was IBSYS built on the SHARE Operating System?
No. It came from the FORTRAN Monitor System and more likely BESYS.
No. IBSYS was based on the FORTRAN Monitor System and, more likely, on Bell Labs' BESYS, rather than on the SHARE Operating System.
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In Field
Source Wikipedia: IBM 7090/94 IBSYS
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Also in Business Atlas: the developer of this subject.
Sources
1. Wikipedia: IBM 7090/94 IBSYS
Infobox: license
Proprietary
Lead section
IBSYS is a discontinued tape-based operating system that IBM supplied with its IBM 709, IBM 7090 and IBM 7094 computers, and a significantly different, though similar operating system provided with IBM 7040 and IBM 7044 computers.
In Field: Operating Systems, Lead sentence
IBSYS is a discontinued tape-based operating system that IBM supplied with its IBM 709, IBM 7090 and IBM 7094 computers, and a significantly different, though similar operating system provided with IBM 7040 and IBM 7044 computers.
View the Source2. Wikidata: IBM 7090/94 IBSYS
- Wikidata Q620465, class allow-list match (w-wdresolver-0926)
- Wikidata Q620465 P577 (publication/release date) claim -> 1960; checked 2026-09-28
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